Schmersal SRB301HC-48-230VAC Safety Relay Module

Schmersal SRB301HC-48-230VAC Safety Relay Module is a safety‑monitoring module designed for installation in control cabinets to safely evaluate signals from positive‑break safety devices such as emergency stop circuits, guard doors, safety mats (SMS from Schmersal), and two‑hand controls. It accepts a supply in the 48–240 VAC range (230 VAC variant) at 50/60 Hz and consumes up to about 1.6 W on 230 V operation (max 4.2 VA). The unit provides three independent safety enabling circuits (13-14, 23-24, 33-34) that open when the corresponding inputs are opened (S13-S14, S23-S24), delivering redundant safety paths for process shutdown. An auxiliary NC signaling contact is available (X1-X2), and a manual start/reset button is provided on the module. Internal electronic fuses protect the supply side (F1) and the secondary side, aligning with its use in safety circuits. The SRB301HC/R‑230V family is intended for safe evaluation of signals from emergency stops, guard monitoring, and related safety devices in accordance with EN ISO 13851:2019, EN ISO 13849‑1:2015, EN ISO 13849‑2:2012, and EN 60947‑5‑1:2017 + AC:2020, making it suitable for cabinet‑mounted safety logic where multiple channels must remain fail‑secure until all monitored circuits return to a safe state.